Fluid supply device

Abstract

An engine cooling device includes a first supply pump driven by an engine, a second supply pump driven by an electric motor, a first fluid path switching valve, a temperature detector, a revolution speed detector that detects the revolution speed of the engine, and a controller that controls the actuation of the electric motor and the fluid path switching valve. When the temperature of the engine detected by the temperature detector (engine cooling water temperature) is less than a first predetermined temperature, the controller performs control to restrict the supply of the cooling fluid from the first supply pump to the engine by switching the fluid path switching valve to a restricted state, and to supply the cooling fluid from the second supply pump to the engine by performing control to drive the electric motor.

The invention claimed is: 
     
       1. A fluid supply device that supplies a cooling fluid to a rotational driving source and cools the driving source, the fluid supply device comprising:
 a first supply pump that is driven by the driving source and supplies the cooling fluid to the driving source; 
 a second supply pump that is driven by an electric motor and supplies the cooling fluid to the driving source; 
 supply switching means for switching between a supply state in which the cooling fluid is supplied by the first supply pump to the driving source and a restricted state in which the supply of the cooling fluid by the first supply pump to the driving source is restricted; 
 temperature detection means for detecting a temperature of the driving source; 
 revolution speed detection means for detecting a revolution speed of the driving source; and 
 actuation control means for controlling actuation of the electric motor and the supply switching means on the basis of detection results from the temperature detection means and the revolution speed detection means, wherein 
 when the temperature of the driving source detected by the temperature detection means is less than a first predetermined temperature, the actuation control means performs control to restrict the supply of the cooling fluid from the first supply pump to the driving source by switching the supply switching means to the restricted state, and to supply the cooling fluid from the second supply pump to the driving source by performing control to drive the electric motor. 
 
     
     
       2. The fluid supply device according to  claim 1 , wherein
 the actuation control means is configured such that, 
 when the temperature of the driving source detected by the temperature detection means is equal to or higher than the first predetermined temperature, 
 the actuation control means: 
 restricts the supply of the cooling fluid from the first supply pump to the driving source by switching the supply switching means to the restricted state, and causes the cooling fluid to be supplied from the second supply pump to the driving source by performing control to drive the electric motor, when the revolution speed of the driving source detected by the revolution speed detection means is less than a first predetermined revolution speed; 
 performs control to increase slowly the supply of the cooling fluid from the first supply pump to the driving source by performing control to switch the supply switching means slowly from the restricted state to the supply state as the revolution speed of the driving source increases from the first predetermined revolution speed to a second predetermined revolution speed, when the revolution speed of the driving source detected by the revolution speed detection means is equal to or greater than the first predetermined revolution speed and less than the second predetermined revolution speed; and 
 causes the cooling fluid to be supplied from the first supply pump to the driving source by switching the supply switching means to the supply state, when the revolution speed of the driving source detected by the revolution speed detection means is equal to or greater than the second predetermined revolution speed. 
 
     
     
       3. The fluid supply device according to  claim 2 , wherein
 when the revolution speed of the driving source detected by the revolution speed detection means is equal to or greater than the first predetermined revolution speed and less than the second predetermined revolution speed and when the revolution speed of the driving source is equal to or greater than the second predetermined revolution speed, control to drive the electric motor is also performed to cause the cooling fluid to be supplied also from the second supply pump to the driving source. 
 
     
     
       4. The fluid supply device according to  claim 1 , wherein the actuation control means is configured to control a revolution speed of the electric motor according to at least either one of the revolution speed detected by the revolution speed detection means and the temperature detected by the temperature detection means, when the electric motor is driven. 
     
     
       5. The fluid supply device according to  claim 1 , wherein
 the supply switching means is configured from a switching valve provided in a flow path through which the cooling fluid discharged from the first supply pump is supplied to the driving source, and 
 switching between the supply state in which the cooling fluid is supplied from the first supply pump to the driving source and the restricted state in which the supply of the cooling fluid from the first supply pump to the driving source is restricted is performed by switching actuation of the switching valve. 
 
     
     
       6. The fluid supply device according to  claim 1 , wherein
 the supply switching means is configured from a power transmission control device provided in a power transmission system which transmits rotational driving power from the driving source to the first supply pump, and 
 switching between the supply state in which the first supply pump is driven by the driving source to supply the cooling fluid from the first supply pump to the driving source and the restricted state in which the drive of the first supply pump by the driving source is cut off to restrict the supply of the cooling fluid from the first supply pump to the driving source is performed by actuation control of the power transmission control device. 
 
     
     
       7. The fluid supply device according to  claim 1 ,
 wherein the first supply pump and the second supply pump are provided in parallel, and 
 wherein the supply switching means is provided downstream of the first supply pump and is not provided in a flow path of the second supply pump. 
 
     
     
       8. A fluid supply device that supplies a cooling fluid to a rotational driving source and cools the driving source, the fluid supply device comprising:
 a first supply pump that is driven by the driving source and supplies the cooling fluid to the driving source; 
 a second supply pump that is driven by an electric motor and supplies the cooling fluid to the driving source; 
 a flow path switching valve which switches between a supply state in which the cooling fluid is supplied by the first supply pump to the driving source and a restricted state in which the supply of the cooling fluid by the first supply pump to the driving source is restricted; 
 temperature detector which detects a temperature of the driving source; 
 revolution speed detector which detects a revolution speed of the driving source; and 
 controller which actuates the electric motor and the flow path switching valve on the basis of detection results from the temperature detector and the revolution speed detector, wherein 
 when the temperature of the driving source detected by the temperature detector is less than a first predetermined temperature, the controller performs control to restrict the supply of the cooling fluid from the first supply pump to the driving source by switching the flow path switching valve to the restricted state, and to supply the cooling fluid from the second supply pump to the driving source by performing control to drive the electric motor. 
 
     
     
       9. The fluid supply device according to  claim 8 , wherein
 the controller is configured such that, 
 when the temperature of the driving source detected by the temperature detector is equal to or higher than the first predetermined temperature, 
 the controller: 
 restricts the supply of the cooling fluid from the first supply pump to the driving source by switching the flow path switching valve to the restricted state, and causes the cooling fluid to be supplied from the second supply pump to the driving source by performing control to drive the electric motor, when the revolution speed of the driving source detected by the revolution speed detector is less than a first predetermined revolution speed; 
 performs control to increase slowly the supply of the cooling fluid from the first supply pump to the driving source by performing control to switch the flow path switching valve slowly from the restricted state to the supply state as the revolution speed of the driving source increases from the first predetermined revolution speed to a second predetermined revolution speed, when the revolution speed of the driving source detected by the revolution speed detector is equal to or greater than the first predetermined revolution speed and less than the second predetermined revolution speed; and 
 causes the cooling fluid to be supplied from the first supply pump to the driving source by switching the flow path switching valve to the supply state, when the revolution speed of the driving source detected by the revolution speed detector is equal to or greater than the second predetermined revolution speed. 
 
     
     
       10. The fluid supply device according to  claim 9 , wherein
 when the revolution speed of the driving source detected by the revolution speed detector is equal to or greater than the first predetermined revolution speed and less than the second predetermined revolution speed and when the revolution speed of the driving source is equal to or greater than the second predetermined revolution speed, control to drive the electric motor is also performed to cause the cooling fluid to be supplied also from the second supply pump to the driving source. 
 
     
     
       11. The fluid supply device according to  claim 8 , wherein the controller is configured to control a revolution speed of the electric motor according to at least either one of the revolution speed detected by the revolution speed detector and the temperature detected by the temperature detector, when the electric motor is driven. 
     
     
       12. The fluid supply device according to  claim 8 , wherein
 the flow path switching valve is configured from a switching valve provided in a flow path through which the cooling fluid discharged from the first supply pump is supplied to the driving source, and 
 switching between the supply state in which the cooling fluid is supplied from the first supply pump to the driving source and the restricted state in which the supply of the cooling fluid from the first supply pump to the driving source is restricted is performed by switching actuation of the flow path switching valve. 
 
     
     
       13. The fluid supply device according to  claim 8 , wherein
 the flow path switching valve is configured from a power transmission control device provided in a power transmission system which transmits rotational driving power from the driving source to the first supply pump, and 
 switching between the supply state in which the first supply pump is driven by the driving source to supply the cooling fluid from the first supply pump to the driving source and the restricted state in which the drive of the first supply pump by the driving source is cut off to restrict the supply of the cooling fluid from the first supply pump to the driving source is performed by actuation control of the power transmission control device. 
 
     
     
       14. The fluid supply device according to  claim 8 ,
 wherein the first supply pump and the second supply pump are provided in parallel, and 
 wherein the flow path switching valve is provided downstream of the first supply pump and is not provided in a flow path of the second supply pump.